Coffee-roasting apparatus.



No. 648,3l8.

Patented Apr. 24, 1900. C. WATSON &. A. G. LOTZ.

COFFEE ROASTING-APPARATUS.

2 Sheets-Shaet l.

(Application filed Dec. 4, 1899.) (No Model'.)

WITNESSES A%%EYS f'yM/k/ No. 648,3l8. Patented Apr. 24, moo.

c. WATSON & A. 6. Lou. I

COFFEE ROASTING APPARATUS.

(Application filed Dec. 4, 1899.)

SSSSSSSSSSSSS 2.

WITNESSES I {UNITED STATES.

PATENT OFFICE.

CHARLES WATSON AND ALVER GOLDMAN LOTZ, OF NEW YORK, N. Y., ASSIGNORSTOTI-IE AMERICAN COFFEE COMPANY, OF SAME PLACE.

COFFEE ROASTING APPARATUS.

' SPECIFICATION forming part of Letters Patent No. 648,318, dated April24, 1900'.' Application filed December 4:, 1899. Serial No. 739,196- (Nomodel.)

To whom it may concern:

Be it known that we, CHARLES WATSON and ALVER GOLDMAN Lorz, citizens ofthe United States, and residents of the city of New York,

borough of Brooklyn, in the county of Kings and State of New York, haveinvented a new and Improved Apparatus for Roasting Coffee, of which thefollowing is a full, clear, and exact description.

This invention relates particularly to improvements in furnaces forroasting coffee and the like; and the object is -to provide a heater soconstructed as to prevent flame from coming in direct contact with thecoffee in the roaster, thus preventing possible burning and loss of thecoffee or a portion thereof.

We will describe a coffee-roaster embodying ouninvention and then pointout the novel features in the appended claims.

Reference is to be had to the'accompanying drawings, forminga part ofthis specification, in which similar characters of reference indicatecorresponding parts inall the figures.

Figure 1 is a sectional elevation, on the line 1 1 of Fig. 2, of acofiee-roaster embodying our invention. Fig. 2 is asection on the line 22 of Fig. 1. Fig. 3 is a section on the line 3 3 of Fig. 2. Fig. 4 is asection on the line 4 4 of Fig. 2. Fig. 5 is a section on the line 5 5of Fig. 2, and Fig. 6 is a section on the line 6 6 of Fig. 2. l

The roaster comprises a cylinder 1, mounted to rotate in a frame 2. Ashere shown, the cylinder has at one end a tubular hub 3, which serves asa sight-opening, so that the contents of the cylinder may be observed,and at the opposite end it has a hub portion 4. The hub portion 3 restsupon rollers 5 and the hub portion 4 rests upon rollers 6. Attached tothe frame 2 is an inlet-spout 7, through which coffee may be passed intothe cylinder; At the opposite end there is also an inlet-spout 8, whichleads through a flue 9, connecting theinterior of the cylinder with afurnace 10. The furnace 10 has a wall 11, of refractory material, andpreferably it will be provided with an asbestos jacket 12. In the lowerportion of the furnace is a combustion-chamber 13, through the bottomwall of which a hot-air-supply pipe 14 leads. This hot-air-supply pipeis provided with a cut-off valve 15, and it communicates with theinterior of the chamber 13 through spaces arranged between posts 16,extended from the 5 5 bottom of the chamber and supporting a solid block17 of refractory material. An airpipe 18 communicates at one end with atube 19, which leads into the combustion-chan1- ber, and at the otherend with a tube 20, which also leads into the combustion-chamber. Agas-supply pipe 21 has a burner-tube 22 extended into the pipe 19 and aburner-tube 23 extended into the pipe 20. These tubes 22 and 23 aresomewhat shorter than the pipes 19 and 20, so that the gas and air maybe thoroughly mingled before passing into the combustion-chamber. Thismingled gas and air may be ignited by passing a lighting device throughan opening 24 in the wall of the furnace.

Arranged above the combustion'chamber 13 are radial bars 25, consistingof fire-brick or other suitable material, and between these radial barsthe hot air passes and thence through the spaces between bars 26 and 27,supported on the bars 25, the said series of bars 26 and 27 being placedat right angles to each other, as plainly indicated in Fig. 3.

The hot air passes from the heating device through the due 9 into thecylinder 1, and the amount of air passing thereto may be regulated byagate-valve 28, arranged to slide over the inner end of the flue 9. Asighttube 29, extended through the upper wall of the furnace, afiords ameans for observing the condition of the heating-bars of the furnace.

In operation the cylinder 1, containing the coffee to be roasted, is tobe kept in constant 0 rotation. The ignited gas in the combustionchamberwill heat the several bars 25, 26, and 27 practically to incandescence,so that the hot air passing from the pipe 14 will become heated to avery high degree by contacting out danger of burning the same. The blockwill also be heated practically to incan descence, and it is obviousthat this block,

" with the several bars, provide'a large heating area over which the airmust pass.

' In using the direct flame of either. gas or coal for roasting purposesif the flame is brought in direct contact with the material beingroasted any impurities in the flame are at times deposited on thematerial being roasted and injures the product. By using the furnacedescribed the products of combustion are deposited therein, and the air(previously heated) being admitted to the fur-' nace is superheated onits passage through the furnace and passes therefrom into theroasting-cylinder at a temperature sufficiently high to uniformly roastthe material and is ,per-

fectly free from impurities that would injuriously affect it.

Having thus described our invention, we

claim as new and desire to secure byLetters v tially as specified.

Patent 1. A coffee-roaster, comprising a cylinder. for containing the:coffee, afurnace having communication with the interior of saidcylcylinder, gas and air pipes leading into a com bustion-chamber in thelower portion of the furnace, bars placed radially in the furnace abovethe combustion-chamber,and cross-bars arranged above the radial bars,all of said bars being of refractory material, substantiallyasspecified.

j 3. A cofiee-roaster, comprising a cylinder for containing the cofiee,a furnace communicating with the interior of the cylinder, gas and airsupply pipes communicating with a combustion-chamber in'the lowerportion of the furnace, a hot-air pipe leading through the bottom of thefurnace and into said chamber, a block of refractory material supportedon spaced bars in the chamber and through the openings between which airfrom the hotair-supply pipe is designed to pass, radial bars in thefurnace above-the combustionchamber,.and cross-bars arranged above theradial bars, the several bars being of refractory material,substantially asspecified.

4. A coffee-roaster, comprising a cylinder for receiving the coffee, afurnace communivalve for controlling communication between the furnaceand the cylinder, substantially as specified.

In testimony whereof we have signed our names to this specification inthe presence of two subscribing witnesses.

